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For the onions: Heat a large oven proof 10-inch nonstick pan, with oil in it, to medium heat.
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Add the onions and season with salt and pepper.
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Cook until the onions are soft and lightly caramelized, about 10 minutes.
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4
Once they are caramelized, pour them into a bowl and set aside.
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5
For the giardiniera frittata: Set the oven to broil.
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6
Whisk the eggs in a bowl.
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Wipe the skillet you cooked the onions in and place back over medium-low heat, then add the butter and olive oil.
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Add the eggs and slowly cook until the bottom is set but the top is still wet, 4 to 6 minutes.
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9
Sprinkle the Hot Giardiniera evenly over the eggs and season with salt and pepper.
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Place the skillet in the broiler on the middle rack and broil until the top is spotty brown and puffy, about 5 minutes.
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11
Let the frittata cool slightly and, using a 3- to 4-inch ring mold, cut out circles that will match the size of your bread.
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12
For the burger: Heat a grill pan to medium-high heat.
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Grill each side of bologna until grill marks form, 3 to 4 minutes a side.
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Once you flip to the second side, top each slice with a piece of cheese and cover with a metal bowl until melted.
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15
For the sandwich build: Layer the bottom bun with a dollop of the Dusseldorf mustard, bologna with cheese, onions and the frittata.
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Schmear the top bun with another dollop of Dusseldorf mustard.
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Close the sandwich, recite the Pledge of Allegiance and eat whole.
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18
Combine 2 cups water and the salt in a glass or non-reactive bowl.
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Mix until the salt is dissolved.
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Add the carrots, cauliflower, serranos, garlic, celery and bell pepper to the salt water and stir to combine.
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Cover and refrigerate overnight.
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22
Day 2, drain and rinse the vegetables.
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23
In a clean bowl, mix together the oil with the oregano and pepper.
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Add the vegetables and mix to combine.
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Allow to marinate overnight.
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26
Giardiniera will only get better with time.
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27
After 2 days at the most in the bowl, you can place in air-tight mason jars and keep in the fridge for at least 2 to 3 weeks.